摘要目的 观察创伤弧菌脓毒症大鼠肺基质金属蛋白酶(MMP)-2/9和组织型金属蛋白酶抑制剂(TIMP)-1/2的动态表达及血必净干预.方法 温州医学院生命科学院实验室,清洁级SD大鼠110只,随机(随机数字法)分为正常对照组(A组,n=10)、创伤弧菌脓毒症组(B组,n=50,采用大鼠左下肢皮下注射创伤弧菌悬液制作创伤弧菌脓毒症大鼠模型)及血必净干预组(C组,n=50,感染后0.5 h腹腔注射血必净4 mL/kg).B、C组大鼠于染菌后1,6,12,24,48 h麻醉后活杀,留取右肺标本.观察大鼠行为学变化,采用考马斯亮蓝法测肺通透性,采用逆转录-聚合酶链式反应(RT-PCR)法测肺MMP-2/9,TIMP-1/2 mRNA的表达,免疫组化法和双抗体夹心酶联免疫吸附法(ELISA)测肺MMP-2/9和TIMP-1/2的表达.数据采用单因素方差分析,并用LSD-t法进行组间两两比较,以P＜0.05为差异有统计学意义.结果 B组和C组肺通透性显著高于A组,C组显著低于B组.B组和C组MMP-2/9,TIMP-1/2mRNA显著升高,B组分别于6 h(0.344±0.108),6 h(1.230±0.377),12 h(0.523±0.098),12 h(0.280±0.070)达高峰(P＜0.05),C组分别于12 h(0.256±0.074),6 h(0.968±0.225),12 h(0.746±0.316),12 h(0.356±0.035)达高峰(P＜0.05),C组MMP-2/9mRNA升高趋势显著低于B组(P＜0.05),TIMP-1/2mRNA显著高于B组(P＜0.05).B组和C组MMP-2/9,TIMP-1/2蛋白也升高,B组分别于12 h(0.692±0.191),12 h(0.061±0.017),24 h(1384.42±91),24 h(41.04±3.60)达高峰(P＜0.05);C组分别于24 h(0.217±0.065),12 h(0.045±0.013),24 h(1617.22±103),24 h(47.66±3.58)达高峰(P＜0.05);C组MMP-2/9蛋白升高趋势低于B组(P＜0.05),TIMP-1/2蛋白早期与B组差别不大,后期显著高于B组(P＜0.05).结论 MMP/TIMP比例失衡是创伤弧菌脓毒症大鼠肺损伤机制之一,血必净可促进MMP/TIMP比例恢复平衡,对创伤弧菌脓毒症大鼠肺损伤具有保护作用.

abstractsObjective To detect the expression of MMP-2/9 and TIMP-1/2 in the lung of Vibrio vulnificus sepsis rats and observe the intervention of Xuebijing injection. Method One hundred and ten SD rats of clean grade were randomly(random number) divided into normal control group (group A, n = 10),Vibrio vulnificus sepsis group (group B, n = 50. Sepsis was reproduced in rats with subcutaneous injection in left lower limb with Vibrio vulnificus) and Xuebijin intervention group ( group C, n = 50. Rats were intraperitoneal(ip) with the dose of Xuebijing 4mL/kg at the time of 30 min later after infection). The rats in group B and C were sacrificed at 1 h, 6 h, 12 h, 24 h, 48 h after infection, the expression of MMP-2/9 and TIMP-1/2 were examined by PCR, Immunohistochemistry or ELISA methods, the lung permeability were measured by Coomassie Brilliant Blue method. Experimental data used single factor analysis of variance, and between groups by LSD method for pairwise comparison,P ＜0.05 statistically significant difference. Results The lung permeability increased both in group B and C compared with group A,and in group B were relatively higher. The lung MMP-2/9, TIMP-1/2mRNA expression in groups B and C compared with in group A was markedly higher, and reached the peak at 6 h(0. 344 ± 0. 108 ),6 h ( 1. 230 ± 0.377 ), 12 h (0.523 ±0.098),12 h(0.280±0.070) (P＜0.05) in group B while at 12 h(0.256 ±0.074),6 h(0.968±0.225) ,12 h(0.746 ±0. 316) ,12 h(0.356 ±0.035) (P ＜0. 05) in group C; the MMP-2/9mRNA expression in group C decreased(P＜0. 05) compared with the group B while the TIMP-1/2mRNA expression increased(P＜0. 05). The lung MMP-2/9, TIMP-1/2 protein expression in groups B and C compared with the group A(0.345±0.109) also increased, and the peak was at 12 h (0. 692 ± 0. 191 ), 12 h (0. 061 ±0.017) ,24 h(1384.42 ±91) ,24 h(41.04 ±3.60)in group B while at 24 h(0. 217 ±0.065) ,12 h(0. 045± 0. 013 ) ,24 h ( 1617.22 ± 103 ) ,24 h (47.66 ± 3.58 )in group C, the MMP-2/9 protein expression in group C was lower than in group B(P＜0.05), the TIMP-1/2 protein expression in group C was similar to in group B early while marked increased(P＜0.05)later. Conclusions MMP/TIMP imbalance was one of the mechanisms of the lung injury in the rats with Vibrio vulnificus sepsis, Xuebijing could restore the balance of MMP/TIMP ratio.